My front diff in my 05 1500HD is piling up.... and really it gives me good reason to ditch these useless 3.73's the truck has. Now for simplicities sake I just want to swap an entire front differential into it and then re-gear the rear.

Because a buddy has a low mileage one does anyone know if the 9.25" IFS changed, either mounting points or otherwise from the GMT400 to the GMT800 chassis? A buddy has a low mile 4.10 9.25" front from a 98 3/4 ton. If it will fit, great. If not I just buy a low mile junkyard unit from a GMT800.

Downtime is key on this rig and swapping diffs is less likely of a problem and a whole lot faster than re-gearing. Plus no waiting for parts and whatnot. I can drive it with mismatched ratios until I get the parts for the back and then do a re-gear. The front is critical as I don't want this truck leaving me somewhere. At the worst I use my 04 for work..... which I don't want to do.

Thanks!

 

I know visually, they look different but not sure if they would interchange.

Unfortunately I think you would have to put them side by side to see if they will work.

If you decide to rebuild or have it rebuilt I have some nice used front 4.10's

 

Yeah I am seeing that already. My google searching netted me findng someone saying the mounts changed to accomodate the new chassis.. and specifically the Duramax. Oh well, was a nice thought. Getting this truck ready for this next work shift probably isn't happening so I will be swapping all my tools and whatnot into my 04..... or at least the stuff I need.

I will be ordering a Detroit locker and new gears for the rear probably tomorrow and start the physical search for the front..... Found a couple wreckers with low mileage 9.25" complete diffs for about $500 so I will be checking them out. I would do a swap for the rear too but I want a Detroit Locker and no more Gov Lock garbage so rebuild for that it is.